Like this?
https://www.retrobike.co.uk/threads/...rsions.380015/
They
should be SRAM shifters (though Shimano compatible) and the brake levers shouldn't be integrated. So your post is confusing. If it's a 21 speed then any Shimano-compatible 21 or 24 grip shifters (including current SRAM MRX) or trigger shifter pods will work.
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Genesis 49:16-17